Cold Central Plant Recycling
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Pre-Construction Testing

Evaluation of Existing Pavement Structure If pavement distreses suggest weak subgrade, or if traffic levels are forcast to increase, check the strength of pavement and subgrade layers with Falling Weight Deflectomer (FWD) or Dynamic Cone Penetrometer (DCP) Recommended
Ground Penetrating Radar (GPR) Verify thickness and consistency of existing asphalt and granular layers Optional
Pavement Sampling Obtain material for mix design and verify thickness of asphalt layers Required if RAP coming from existing pavement
Stockpile Sampling Obtain material for mix design Required if RAP coming from existing stockpile
Mix Design Conduct mix design for emulsified asphalt in accordance with ARRA CR201 or AASHTO PP 86-17 and MP 31-17. Conduct mix dsign for foamed asphalt in accordance with ARRA CR202. Required

Construction Testing

Bituminous Recycling Agent Injection Rate 

Verify amount of recycling agent per mix design by meter reading

Required

 Asphalt for Foaming

Supplier generated COA or laboratory testing to comply with mix design parameters

Recommended

 Asphalt Temperature for Foaming

Probe or infrared temperature gun

Required

Asphalt Foaming Properties 

Expansion Ratio and Half-life

Required

Emulsified Asphalt

Visual sieve test on site

Recommended

Emulsified Asphalt

Supplier generated COA or laboratory testing to comply with mix design parameters

Recommended

Emulsified Asphalt Temperature

Probe or infrared temperature gun

Recommended

 Cement and Lime

Supplier generated COA

Recommended

 Cement or Lime Injection Rate 

Verify amount of recycling additive per mix design by meter reading

Required

Lime or Cement Slurry Solids

% solids by drying or hydrometer

Recommended

Corrective Aggregate Gradation 

Supplier generated COA or laboratory analysis

(AASHTO T 11 and  T 27 or ASTM C117 and C136)

Required

Corrective Aggregate Physical Properties 

Supplier generated COA or laboratory analysis

(AASHTO T 96, T 176 or  ASTM C131, D2419)

Recommended

Corrective Aggregate Addition Rate 

Verify amount of corrective aggregate per mix design by meter reading

Required

RAP Maximum Particle Size

AASHTO T 27

ASTM C136

Air dried or wet gradation

Required

RAP Gradation 

Air dried or wet gradation measured to No. 30 Sieve

Recommended

RAP Temperature

Probe measurement or infrared temperature gun

Recommended

Moisture Content of Recycled Mixture 

AASHTO T 329

AASHTO T 265, ASTM D2216 or ASTM D4643

Recommended

Control Strip

Nuclear gauge per

AASHTO T 355 (ASTM D2950) or Owner Agency equivalent

Required

Cross-slope

4 ft. (1 m) Smart level

Recommended

Depth of Recycled Material

Depth probe measurement

Recommended

Mat Width 

Tape measurement

Recommended

Recycled Material Compacted Density 

Nuclear gauge AASHTO T 355 (ASTM D2950) or Owner Agency approved method

Required


Post-Construction Testing

Visual Appearance Verify there are no unacceptable defects before placing surface course Required
Mat Moisture Content After Curing AASHTO T 329 or AASHTO T 265 (ASTM D2216 or ASTM D4643) Required
Surface Tolerance 10 ft. (3 m) Straight edge Recommended